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<pre><span class="comment"> /****************************************************************************
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 ** Copyright (C) 2007-2008 Trolltech ASA. All rights reserved.
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 #include &lt;QtGui&gt;

 #include &quot;mainwindow.h&quot;
 #include &quot;treemodel.h&quot;

 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent)
 {
     setupUi(this);

     QStringList headers;
     headers &lt;&lt; tr(&quot;Title&quot;) &lt;&lt; tr(&quot;Description&quot;);

     QFile file(&quot;:/default.txt&quot;);
     file.open(QIODevice::ReadOnly);
     TreeModel *model = new TreeModel(headers, file.readAll());
     file.close();

     view-&gt;setModel(model);
     for (int column = 0; column &lt; model-&gt;columnCount(); ++column)
         view-&gt;resizeColumnToContents(column);

     connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

     connect(view-&gt;selectionModel(),
             SIGNAL(selectionChanged(const QItemSelection &amp;,
                                     const QItemSelection &amp;)),
             this, SLOT(updateActions()));

     connect(actionsMenu, SIGNAL(aboutToShow()), this, SLOT(updateActions()));
     connect(insertRowAction, SIGNAL(triggered()), this, SLOT(insertRow()));
     connect(insertColumnAction, SIGNAL(triggered()), this, SLOT(insertColumn()));
     connect(removeRowAction, SIGNAL(triggered()), this, SLOT(removeRow()));
     connect(removeColumnAction, SIGNAL(triggered()), this, SLOT(removeColumn()));
     connect(insertChildAction, SIGNAL(triggered()), this, SLOT(insertChild()));

     updateActions();
 }

 void MainWindow::insertChild()
 {
     QModelIndex index = view-&gt;selectionModel()-&gt;currentIndex();
     QAbstractItemModel *model = view-&gt;model();

     if (model-&gt;columnCount(index) == 0) {
         if (!model-&gt;insertColumn(0, index))
             return;
     }

     if (!model-&gt;insertRow(0, index))
         return;

     for (int column = 0; column &lt; model-&gt;columnCount(index); ++column) {
         QModelIndex child = model-&gt;index(0, column, index);
         model-&gt;setData(child, QVariant(&quot;[No data]&quot;), Qt::EditRole);
         if (!model-&gt;headerData(column, Qt::Horizontal).isValid())
             model-&gt;setHeaderData(column, Qt::Horizontal, QVariant(&quot;[No header]&quot;),
                                  Qt::EditRole);
     }

     view-&gt;selectionModel()-&gt;setCurrentIndex(model-&gt;index(0, 0, index),
                                             QItemSelectionModel::ClearAndSelect);
     updateActions();
 }

 bool MainWindow::insertColumn(const QModelIndex &amp;parent)
 {
     QAbstractItemModel *model = view-&gt;model();
     int column = view-&gt;selectionModel()-&gt;currentIndex().column();

     <span class="comment">//</span> Insert a column in the parent item.
     bool changed = model-&gt;insertColumn(column + 1, parent);
     if (changed)
         model-&gt;setHeaderData(column + 1, Qt::Horizontal, QVariant(&quot;[No header]&quot;),
                              Qt::EditRole);

     updateActions();

     return changed;
 }

 void MainWindow::insertRow()
 {
     QModelIndex index = view-&gt;selectionModel()-&gt;currentIndex();
     QAbstractItemModel *model = view-&gt;model();

     if (!model-&gt;insertRow(index.row()+1, index.parent()))
         return;

     updateActions();

     for (int column = 0; column &lt; model-&gt;columnCount(index.parent()); ++column) {
         QModelIndex child = model-&gt;index(index.row()+1, column, index.parent());
         model-&gt;setData(child, QVariant(&quot;[No data]&quot;), Qt::EditRole);
     }
 }

 bool MainWindow::removeColumn(const QModelIndex &amp;parent)
 {
     QAbstractItemModel *model = view-&gt;model();
     int column = view-&gt;selectionModel()-&gt;currentIndex().column();

     <span class="comment">//</span> Insert columns in each child of the parent item.
     bool changed = model-&gt;removeColumn(column, parent);

     if (!parent.isValid() &amp;&amp; changed)
         updateActions();

     return changed;
 }

 void MainWindow::removeRow()
 {
     QModelIndex index = view-&gt;selectionModel()-&gt;currentIndex();
     QAbstractItemModel *model = view-&gt;model();
     if (model-&gt;removeRow(index.row(), index.parent()))
         updateActions();
 }

 void MainWindow::updateActions()
 {
     bool hasSelection = !view-&gt;selectionModel()-&gt;selection().isEmpty();
     removeRowAction-&gt;setEnabled(hasSelection);
     removeColumnAction-&gt;setEnabled(hasSelection);

     bool hasCurrent = view-&gt;selectionModel()-&gt;currentIndex().isValid();
     insertRowAction-&gt;setEnabled(hasCurrent);
     insertColumnAction-&gt;setEnabled(hasCurrent);

     if (hasCurrent) {
         view-&gt;closePersistentEditor(view-&gt;selectionModel()-&gt;currentIndex());

         int row = view-&gt;selectionModel()-&gt;currentIndex().row();
         int column = view-&gt;selectionModel()-&gt;currentIndex().column();
         if (view-&gt;selectionModel()-&gt;currentIndex().parent().isValid())
             statusBar()-&gt;showMessage(tr(&quot;Position: (%1,%2)&quot;).arg(row).arg(column));
         else
             statusBar()-&gt;showMessage(tr(&quot;Position: (%1,%2) in top level&quot;).arg(row).arg(column));
     }
 }</pre>
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